MP3 Audio Encoder

The MP3 encoder Application Programming Interface (API) provides a variety of capabilities, including bitstream packing functions and MP3 core encoding functions, See [ISO/IEC 11172-3]. This chapter provides a reference guide to the Intel^® Integrated Performnace Primitives (Intel^® IPP) MP3 audio encoder API. As shown in Figure below, this API includes several functions as well as predefined macros and constants.

Intel® IPP MP3 Encoder API Flowchart

AnalysisPQMF_MP3
Implements stage 1 of MP3 hybrid analysis filterbank.
AnalysisFilterInit_PQMF_MP3
Initializes PQMF MP3 analysis specification structure.
AnalysisFilterInitAlloc_PQMF_MP3
Allocates memory and initializes the PQMF MP3 analysis specification structure.
AnalysisFilterGetSize_PQMF_MP3
Returns size of PQMF MP3 analysis specification structure.
AnalysisFilterFree_PQMF_MP3
Frees memory allocated for PQMF MP3 analysis specification structure.
AnalysisFilter_PQMF_MP3
Transforms PQMF MP3-processed subband signals into time domain samples.
MDCTFwd_MP3
Implements stage 2 of the MP3 hybrid analysis filterbank.
PsychoacousticModelTwo_MP3
Implements ISO/IEC 11172-3 psychoacoustic model recommendation 2 to estimate masked threshold and perceptual entropy associated with a block of PCM audio input.
JointStereoEncode_MP3
Transforms independent left and right channel spectral coefficient vectors into combined mid/side and/or intensity mode coefficient vectors suitable for quantization.
Quantize_MP3
Quantizes spectral coefficients generated by analysis filterbank.
PackScaleFactors_MP3
Applies noiseless coding to scalefactors and packs output into bitstream buffer.
HuffmanEncode_MP3
Applies lossless Huffman encoding to quantized samples and packs output into bitstream buffer.
PackFrameHeader_MP3
Packs the content of the frame header into the bitstream.
PackSideInfo_MP3
Packs the side information into the bitstream buffer.
BitReservoirInit_MP3
Initializes all elements of the bit reservoir state structure.

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